He purchased the butterfly as seen in the photos, I'm not sure what the wings are made of but it looks like some fairly thin cloth/nylon/spandex type material. In the Instructable he says that the wings will be finished in fabric that matches the dress.
Some of this technology has been perfected and mass marketed in the RC helicopter and airplane world. Minature recievers, lithum ion batteries, tiny servos made from motors and a leadscrew occuping less than 1/2 of a CC. The green led in this case tells the operator that the system is powered and ready. I would have modified a Ready to fly Blade MCX which costs $135 and includes a co-axial 4 channel helicopter, 4 channel radio, battery and charger...
A moving mechanical butterfly in your hair would really turn some heads. It seems that DelFly is on to something similar although they could use some tips in making their ornithopters more "butterfly" looking. And, of course, remove the camera as well. Getting it to alight on top of the brides hair whilst in the course of reciting her vows would also get a few "wows".
This is a neat project indeed. My guess is a small gearmotor, although I can think of a couple of ways to do it using a small motor similar to the vibration motor in a pager. Then a PWM drive to slow it down, and it is done, except if it needs to be checking for movement to tigger the motion.
But this project could indeed be the start of another fad.
Earlier this year paralyzed IndyCar drive Sam Schmidt did the seemingly impossible -- opening the qualifying rounds at Indy by driving a modified Corvette C7 Stingray around the Indianapolis Motor Speedway.
Wearables are changing the way we see ourselves. With onboard sensors that have access to our bodies, we are starting to know our physical selves like never before, quantifying our activity, our heart rate, breathing, and even our muscle effort.
Last week, the bill for reforming chemical regulation, the TSCA Modernization Act of 2015, passed the House. If it or a similar bill becomes law, the effects on cost and availability of adhesives and plastics incorporating these substances are not yet clear.
This year, Design News is getting a head start on the Fourth of July celebration. In honor of our country and its legacy of engineering innovation -- in all of its forms -- we are taking you on an alphabetical tour through all 50 states to showcase interesting engineering breakthroughs and historically significant events.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.